Tree to 60 m., usually 30 m. or less, with upright branches and an open crown; branchlets with small lenticels, glabrous or glabrate. Leaves with 5-10 pairs of leaf-lets 9-25 cm. long by 3-8.5 cm. wide, elliptical to ovate to ovate-lanceolate, seldom lanceolate, the base subacute to rounded, slightly oblique, the apex obtuse to long-acuminate, pubescent along the midrib above, scantily puberulent to thickly pubes-cent and scattered hirsute, primarily on the veins and venules below, sometimes glabrous or with the axils of the secondary veins barbate. Inflorescences variable in size, often about equalling the length of the leaves, usually puberulent; bracts caducous. Flowers 6-9 mm. long; calyx shallowly cupulate and usually split at one side, 2-3 mm. deep, the margin irregularly shallowly lobed to definitely 5-lobed, often scattered puberulent, dark in color; petals elliptical, densely pubescent, red-dish near the apex; filaments of the stamens fleshy, the anthers apiculate, 0.8-1.9 mm. long; ovary 1-1.5 mm. long, hemispherical, puberulent; style 1.5-3 mm. long, thick, puberulent; capitate stigma about 0.5 mm. thick, glabrous. Fruit 2.5-5 cm. long, the valves thin (to 1.5 mm. thick), the central column with 5 conspicuous wings extending nearly to the narrow apex.
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A tree. It grows 10-20 m tall. The leaves have 8 pairs of leaflets. They are oval to sword shaped and 12-16 cm long by 3-4 cm wide. The fruit is a capsule with 5 valves. They are 4-5 cm long.
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